Island



TRUMAN FREEMAN, JR., OF PROVIDENCE, RHODE ISLAND.

ROTARY PUMP.

Specification of Letters Patent No. 23,764, dated April 26, 1859*.

T o all whom it 'may concern:

Be it known that I, 'TRUMAN FREEMAN, J r., of the city and county ofProvidence, in the State of Rhode Island and Providence Plantations,have invented an Improvement in Rotary Pumps; and I do hereby declarethat the following is a full and exact description thereof, referencebeing had to the accompanying drawings, in which- Figure 1 is aperspective View of the pump. Fig. 2 is a side elevation with one sideof the case removed. Fig. 3 is a longitudinal central vertical sectionof the pump. Fig. 4 is a view of the interior of the side of the case,removed from Fig. 2, and Fig. 5 is an end view of the drum, andthe partsattached to it.

Ihe same part is indicated by the same letter in all the figures.

A, marks the position of the shaft; B, the eduction pipe; C, theinduction pipe; D, the rim of the drum; E, the outer circumference ofthe cylindrical case; F, the abutment; G, the cavities in the rim of thedrum to receive the pistons; H, the pistons; I, the cam which operatesthe dogs; K, the pin on which the outer arms of the dogs strike to throwthe pistons down; L, screws confining the abutment in place; M, socketsfor the screws which hold the sides of the case together; P, the outerarms of the dogs; Q, the dogs which operate the pistons; S, the pinsupon which the dogs turn; W, the wheels on the inner arms of the dogs;w, the pins on which wheels IV turn.

The nature of my invention consists in the method of operating thepistons of rotary pumps, hereinafter more particularly described andshown.

Within a cylindrical case E, is placed a drum with flanges fittingclosely Vthe inner circumference of the case, the rim of the drum, theflanges, and the inner circumference of the case forming a water tightbox or trough. Within this box, on the farther side of the eduction pipeB, is placed a fixed abutment F, extending from the case to the drum,secured by screws L passing through the case, and occupying the space inthe box nearly to the induction pipe C. The induction and eductionpipes, furnished with the usual valves are placed diametrically oppositeeach other. The drum axle passes through the sides of the case. Theabutment F, is so placed that it presents a barrier at the point justbeyond the opening into the tons, fit, water tight, the ianges of thedrum,

and the inner circumference of the case, lifting the water and bearingit through the box to the eduction pipe.

In the interior of the case, upon one of its inner faces, is placed bythe side of the aperture within which the axle A revolves, a cam I,circular in form, extending about a quarter of a circle. This cam israised sufficiently to touch the side of the drum when the case isclosed. Near the outer edge of this inner face of the cylindrical case,is placed a pin K, inclosed in a roller to lessen the friction, soadjusted that when the case is closed, it shall be near thecircumference of the anges of the drum, and opposite a point just beyondthe eduction pipe B, so that it may throw down the pistons H, beforethey strike the abutment F, thus preventing the wear upon the pistons.Dogs or levers, Q, are placed upon that part of the shaft or pin S,which forms the hinge of the flap or piston, projecting beyond the rimof the drum toward the inner face of the side of the case. They are soconstructed that one arm P, plays against the pin K, inclosed in theroller before described, and the other arm provided with a wheel W,plays over the circumference of the quadricircular cam I, beforedescribed.

The operation of the pump is as follows: Turn the drum by the crank onthe drum axle so that one piston shall be near the opening in the caseto the eduction pipe B; the second piston is a little more than half waybetween this piston and the induction pipe C. Each piston is raised andkept up by the wheel W, on the inner arm of the dog Q, which is fastenedto its hinge playing over the cam I. The third piston has passed. underthe abutment, and is approaching the induction pipe C; the fourth pistonis passing under the abutment, having fallen into the cavity G, in therim of the drum. The water which has been raised by the rst piston,meeting the abutment, and being unable to pass by or under it, has beenforced out of the eduction pipeY B. As the drum axle continues itsrevolution, carrying the drum With it, the first piston passes by theeduction pipe, and before it reaches the abutment, the outer arm P, ofthe dog Q, placed on the shaft of the piston, strikes against the pin K,placed upon the inner face of the side ofthe case, and the piston H isthrown back, and down into the cavity Gr, in the rim of the drum, sothat it passes under the abutment. Vhile this action is being pro--duced upon the first piston, the third piston passes by the inductionpipe, and as the drum revolves, the Wheel XV, on the inner arm of thedog, strikes the cam I, elevating the piston in the box or trough sothat a new bucket is formed; and so on with the second and fourthpistons, the third and first, and the fourth and second in succession.

The pins or shafts S', forming the hinges of the pistons, are packed instuiiing boxes, Where they pass through the sides of the drum, or ateach extremity of the pin or shaft. The drum axle is also packed instuiiing boxes Where it passes through the sides of the case. Y

I do not claim the cylindrical case, the drum moving on the axle, thefixed abutment, the flaps or pistons hinged to the rim of the drum andpassing under the abutment, nor the raising of Water by a rotary uinp.

What I claim and desire to secure by Letters Patent is- The combinationof the pistons H, with the dogs Q, constructed as described, andarranged for conjoint operation with the cani I, and pin K,substantially in the manner specified.

Providence, February Q8, 1859.

TRUMAN FREEMAN, JR.

Witnesses:

JNO. E. MARTIN, JOSEPH L. PITMAN.

